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在低压环境下,由Nd:YAG脉冲激光器产生的1.06μm激光烧蚀金属A1靶产生等离子体,观测了外加电场下其空间分辨发射光谱,并由此分析了谱线相对强度、谱线展宽随外加电压的演化特性.结果发现:原子谱线强度及其半高全宽随外加电压的增加均有明显增大,而离子谱线受外加电压的影响较小.从微观机制上分析推断:外加电场使非稳态等离子体中的电子作定向运动,加剧电子与原子之间的碰撞是上述结果的主要原因.此外,由发射光谱线的Stark展宽计算了等离子体电子密度,并由实验结果讨论电子密度随外加电压的演化特性和空间演化特性.
Under the condition of low pressure, plasma was produced by laser ablation of 1.06μm laser produced by Nd: YAG pulsed laser to excite the plasma, and the spatially resolved emission spectrum was observed under the applied electric field. The relative intensity of the spectrum and the spectral broadening The results show that the intensity of the atomic line and the full width at half maximum increase with the increase of the applied voltage, but the ion spectrum is less affected by the applied voltage.According to the microscopic mechanism, it is inferred that the applied electric field Electrons in the unsteady plasma make directional movement and intensify the collisions between electrons and atoms, which are the main reasons for the above results.In addition, the electron density of plasma is calculated from the Stark broadening of the emission line, and the electron density Evolutionary characteristics and spatial evolution characteristics with applied voltage.